George Mwangi (L) and Joel Warvare Karinga, who survived the Somali militant Islamist group al Shabaab attack last Tuesday, look for their belongings at the quarry where the militants killed 36 non-Muslim workers near the town of Mandera, at the Kenya-Somalia border December 6, 2014.
REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

George Mwangi, who survived the Somali militant Islamist group al Shabaab attack last Tuesday, looks for his belongings at the quarry where militants killed 36 non-Muslim workers near the town of Mandera, at the Kenya-Somalia border December 6, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW) 

A man rides in a donkey cart past Kenya policemen as he crosses from Kenya into Somalia at the border town of Mandera December 5, 2014. Somali al Shabaab Islamist militants killed 36 non-Muslim workers at a quarry in Mandera, northeast Kenya on Tuesday, prompting the president to sweep out his top security officials in order to tackle a relentless wave of violence. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST TPX IMAGES OF THE DAY) 

A Kenyan policeman talks to children, crossing from Somalia to Kenya, in the border town of Mandera, December 5, 2014. Somali al Shabaab Islamist militants killed 36 non-Muslim workers at a quarry in Mandera, northeast Kenya on Tuesday, prompting the president to sweep out his top security officials in order to tackle a relentless wave of violence. Picture taken on December 5, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST SOCIETY) 

Men push a bus to get the engine started, as it travels to Nairobi, in Mandera town at the Kenya-Somalia border, December 6, 2014. Somali al Shabaab Islamist militants killed 36 non-Muslim workers at a quarry in Mandera, northeast Kenya on Tuesday, prompting the president to sweep out his top security officials in order to tackle a relentless wave of violence. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY) 

George Mwangi (L) and Joel Warvare Karinga, who survived the Somali militant Islamist group al Shabaab attack last Tuesday, stand in the spot where militants killed 36 non-Muslim workers at a quarry near the town of Mandera, at the Kenya-Somalia border December 6, 2014.
REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

A girl stands in line in front of a bus with other passengers travelling to Nairobi, as they wait to be searched for weapons by Kenyan police, in the town of Mandera at the Kenya-Somalia border December 8, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW TPX IMAGES OF THE DAY) 

A plainclothes policewoman searches female passengers, travelling to Nairobi, for weapons in the town of Mandera at the Kenya-Somalia border December 8, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW) 

A Christian man prays in a church during a Sunday mass in town of Mandera, at Kenya-Somalia border December 7, 2014.
REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST RELIGION) 

A man looks out of a bus as it travels to Nairobi, next a police vehicle escorting it through Mandera town, at the Kenya-Somalia border, December 6, 2014. Somali al Shabaab Islamist militants killed 36 non-Muslim workers at a quarry in Mandera, northeast Kenya on Tuesday, prompting the president to sweep out his top security officials in order to tackle a relentless wave of violence. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST SOCIETY TPX IMAGES OF THE DAY) 

A Christian man enter a church during a Sunday mass in town of Mandera, at Kenya-Somalia border December 7, 2014.
REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST RELIGION) 

Passengers travelling to Nairobi stand in front of a bus, as they wait to be searched for weapons by Kenyan police, in the town of Mandera at the Kenya-Somalia border December 8, 2014. REUTERS/Goran Tomasevic (KENYA - Tags: CIVIL UNREST CRIME LAW)